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Hi, Mark....that seems to be the general consensus,
and I agree that it is the most likely cause of the fuel starvation. I ran
the aircraft several times yesterday, and it still ran as smooth as ever.
I tried a couple of aborted takeoffs, and it still ran great. Good acceleration,
nosewheel off the ground by 1200 feet. Unfortunately, until I vent the
sump tank and install firesleeving on my fuel lines, the nosewheel is the only
part of the plane that is going to leave the ground. Will keep you
posted. Thanks again for your input. Paul Conner, off to the
welder
----- Original Message -----
Sent: Monday, February 14, 2005 10:09
AM
Subject: [FlyRotary] Re: Bad day at the
airport
Paul,
It looks like the
group has focused in on the fuel system, or more specifically the sump tank as
the likely culprit. I suspected you might have been running mogas.
Its my understanding that auto fuel has a much lower vapor pressure than
avgas and is therefore more likely to vapor lock.
Just a SWAG, but I
think the engine and related systems got hot enough to heat the fuel in the
fuel rails so that once it passed the pressure regulator (pressure drop) it
started to boil, similar to when you open a hot soda. With the return
fuel going to an unvented tank, the boiling fuel expanded enough to cause
pressure in the header tank so as to prevent fresh fuel from flowing into the
tank. Eventually, the header tank ran dry and the engine quit. You
sure handled the situation like a pro. Hope I never have to face that
scenario.
Mark S.
Hi, Mark...my humblest appologies
for taking so long to respond. I am whittling down the 200 plus messages
in my inbox. I was using auto fuel (regular). I have a fuel return line
and it goes to the top of my aluminum sump tank that is located on the cool
side of the firewall (inside the cabin, behind the rear seat). The return line
is -8 in size. Hope this helps. Paul
Conner
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